Joint fixing structure of hand-held power tool

Abstract

A joint fixing structure of a hand-held power tool includes a fixing base connected with a tool head. Two opposite sides of the fixing base have through holes with movable balls. The fixing base is surrounded by a C-shaped ring with two protrusions. The C-shaped ring is surrounded by a control ring that has an circular outer surface and an inner surface provided with two recesses. The control ring is operated to rotate relative to the C-shaped ring between an unlocked position and a locked position. When in the unlocked position, the protrusions go into the recesses, making the C-shaped ring not press the balls so that the tool head can be pivoted freely. When in the locked position, the tool head is locked by the balls being pressed by the deformation of the C-shaped ring due to the motion of the protrusions out of the recesses.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a hand-held power tool, and more particularly to a joint fixing structure of a hand-held power tool.BACKGROUND OF THE INVENTION[0002]FIG. 9 shows a conventional hand-held power tool which may be a power tool or a pneumatic tool. The power tool has a main body 5. One end of the power tool is pivotally connected with a tool head 51. The tool head 51 can be adjusted and pivoted relative to the main body 5 to meet the working angle required when in use. One end of the main body 5, close to the tool head 51, is provided with a tightening ring 52. The tightening ring 52 is connected with a knob 53 that can be pulled and rotated. After the adjustment of the pivoting angle of the tool head 51 is completed, the knob 53 is operated to move in the direction of the main body 5, and the tightening ring 52 is pressed inwardly to retain the tool head 51 so that the tool head 51 is no longer pivoted to start working.[0003]However, when th...

AI Technical Summary

Benefits of technology

[0004]The present invention is to provide a joint fixing structure of a hand-held power tool, which has a simple arcuate configuration as a whole and does not have a structure that protrudes outward, so that the appearance is simple and beautiful.

[0005]In order to achieve the aforesaid object, a joint fixing structure of a hand-held power tool is provided. The hand-held power tool comprises a main body and a tool head. The main body is connected to the tool head through a flexible transmission shaft. The tool head is pivotable relative to the main body. The joint fixing structure comprises a plurality of annular grooves, a fixing base, a C-shaped ring, and a control ring. The annular grooves are disposed on a spherical seat of the tool head. The fixing base is embedded in the main body. The fixing base has a receiving room for receiving the spherical seat. The spherical seat is pivotable in the receiving room. Two opposite sides of the fixing base are provided with through holes. The through holes are provided with balls movable in the through holes. The C-shaped ring surrounds an outer periphery of the fixing base. An inner peripheral surface of the C-shaped ring is provided with press portions corresponding in position to the balls. An outer peripheral surface of the C-shaped ring is provided with protrusions corresponding in position to the press portions. One side of each of the protrusions has a first bevel. The protrusions are arranged symmetrically relative to a center of the C-shaped ring. The control ring has an outer annular surface in a circular shape. The control ring has an inner annular surface surrounding the outer peripheral surface of the C-shaped ring. The inner annular surface has two opposite recesses. One side of each of the recesses has a second bevel corresponding to the first bevel. The control ring is operated to rotate relative to the C-shaped ring between an unlocked position and a locked position. When the control ring is rotated to the unlocked position, the recesses correspond in position to the protrusions, the protrusions of the C-shaped ring extend into the recesses freely, and the press portions do not push the balls so that the tool head can be pivoted relative to the main body freely. When the control ring is rotated to the locked position, the protrusions are moved out of the recesses and pushed by the inner annular surface of the control ring, the C-shaped ring is deformed inwardly with the press portions to push the balls, and the balls are pressed against the annular grooves of the spherical seat to retain the tool head.

Problems solved by technology

Holding the raised knob 53 causes pain in the palm to affect the handling feel and lower the quality of work.

In addition, the raised knob 53 is not aesthetically pleasing in the overall appearance of the power tool, and its complex shape causes inconsistencies.

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